diff --git a/src/lib.rs b/src/lib.rs
index 6bfad07..b2e7303 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -184,6 +184,17 @@ fn create_frame_string(value: Vec<String>) -> String {
         .join(",")
 }
 
+/// This part of the code is not already used
+#[allow(dead_code)]
+fn concat_line(main_string: String, frame_string: String) -> String {
+    let buf: bool = false;
+    if buf {
+        let from: String = String::from("#####");
+        main_string.replace(&from, &frame_string)
+    } else {
+        format!("{}@{}", main_string, frame_string)
+    }
+}
 /// ## Basic listing of the library
 /// ### Description
 ///
@@ -328,3 +339,10 @@ fn test_create_frame_string() {
     let expected: String = "1-3,5".to_string();
     assert_eq!(expected, create_frame_string(source));
 }
+#[test]
+fn test_concat_line() {
+    let main_string: String = String::from("toto");
+    let frame_string: String = String::from("bar");
+    let expected: String = String::from("toto@bar");
+    assert_eq!(expected, concat_line(main_string, frame_string));
+}
diff --git a/src/main.rs b/src/main.rs
index 338b428..beffa34 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,6 +18,9 @@ struct Args {
     /// Represent output as a tree
     #[arg(short, long)]
     tree: bool,
+    /// Display Buf format
+    #[arg(short, long)]
+    buf: bool,
 
     /// Path to parse
     #[arg(value_name = "PATH", default_value_t = String::from("./"))]